SQL & PL/SQL :: Tune Query Without Creating Any Objects Like Indexes?
Jan 14, 2013
Can we tune below mentioned query without creating any indexes :
SELECT /*+ PARALLEL(a,64) */x_abc_41, x_abc_44, CALLED_FROM_NUM, X_abc_25, created, evt_stat_cd, last_date, x_abc_number_from,
x_abc_complete_date
FROM table a
WHERE a.todo_cd in('MNPIN','MNPOUT')
AND a.x_abc_25 = 'NP RFS'
AND a.created BETWEEN sysdate-180 AND sysdate
Explain Plan :
PLAN_TABLE_OUTPUT
Plan hash value: 3718629559
----------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
----------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 11 | 2376 | 9462 (4)| 00:02:51 | | | |
[code]...
Note : Currently this query is taking 3 Minutes for retrieving 8000 records,But should be executed in less than 1 min.
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Feb 14, 2013
I Want to tune the attached query. I have tried by creating the normal indexes and composite indexes on the fields . I feel that , Only normal index is required for this instead of composite index?
11:15:19 SQL> @slot.sql
11:16:03 SQL>
11:16:03 SQL> drop table slot purge;
Table dropped.
Elapsed: 00:00:00.05
11:16:03 SQL>
11:16:03 SQL> create table slot
11:16:03 2 (
11:16:03 3 id varchar2 (40) not null,
[code]....
- dynamic sampling used for this statement
22 rows selected.
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May 4, 2010
I'm creating a stored procedure where i get to return (OUT parameter) a cursor that points to a custom table. If I create an object, I could just do something like:
Quote: CREATE OR REPLACE TYPE TmpObjType AS OBJECT
(...);
CREATE OR REPLACE TYPE TmpObjTblType AS TABLE OF TmpObjType;
PROCEDURE tmp_proc (...,
out_param_resultset OUT g_cursor_type )
....
OPEN out_param_resultset FOR
SELECT * FROM TABLE(CAST(tmpObjTbl AS TmpObjTblType));
....
How do I return the table (referenced by a cursor) without creating objects?
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Jul 9, 2013
aix 6.111.2.0.3 I have an expdp dump from prod to be imported to our test database.I have imported it using impdp, but to my surprise the tables were imported but lots of indexes were not created? even If I have used TRANSFORM=SEGMENT_ATTRIBUTES:N just to use the default USERS tablespace. How do I import the indexes separately, skipping the tables and other objects?
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Mar 16, 2010
Lot of my tables are just for join purpose , a table with just with two columns both FK , I did not add any composite PK to this table, lot my queries uses this table , because it does not have composite PK will the query be slow ? what I have to do to increase performance querying with such tables ?
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Mar 29, 2012
hint of which DBA views we need to query to find current running queries which are not using indexex?
I suppose v$session is one , what else we need to look to?
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Jun 1, 2012
I don't have any dba privileges, can you share a scripts which can tell how many block my query is fetching with or without indexes. How do i also get buffer hit, how can i get i/o without sql trace as i don't have access to dump_dest
I have a below query
SELECT DISTINCT ser_id AS STA_ser_id, rct_name AS STA_name
FROM sd_servicecalls, rep_codes, rep_codes_text
WHERE ser_sta_oid = rcd_oid
AND rcd_oid = rct_rcd_oid
AND rct_name IN ('New', 'Awaiting Approval', 'Approved', 'In Progress', 'Awaiting Supplier', 'Awaiting RFC', 'Awaiting Release', 'Pending Release', 'On Hold', 'Resolved', 'Implemented', 'Closed');
Does large hash value in explain plan mean more resource needed and more time to execute the query, How can i use ADDM for the above sql.
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Jul 10, 2013
Quote:by default the job runs once every 24 hours.
When you see LAST_ANALYZED being days, weeks, or months in the past do not be alarmed.
If/when the data in a table does not change, then the statistics do not need to change.
Oracle collects new statistics when enough of the data (about 10%) has changed.
Like above statement for DBMS_STATS job, is there a automatic job that runs every day to compile invalid objects for schema or we need to compile it manually ?
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Sep 29, 2012
I need a job to get executed for every 1hour.Like i need a query to identify invalid objects in database per schema ,invalid type and this is a job to run every hour.How to schedule it.I only know that dba_jobs have the info.
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Feb 1, 2013
trim down the following sql to within 255 characters help:
select indate
from (
select case count(inputDate)
when 1 then inputdate
end as indate
from commLeaseBut5
[code]...
This sql is check a date field in the database for record which, if the date field is blank it should be a new record. Then the sql will assigned the current timestamp and stored to the new record. Otherwise, the sql will return the record timestamp for display.
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Mar 22, 2013
os version is solaris 10
db version 11.2.0.3
how to tune log file sysnc waits in 11gr2 what parameters are involving in tuning log file sync and what would be its optimal values.
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Nov 19, 2012
We know and perform lots of tuning stuff on our databases, mainly on primary side.
but the set of queries running on standby databases (like to use for reporting purpose) are totally different from one running at primary.
so How can we tune out our Standby DB to perform well ?
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Dec 8, 2010
I am using dbms_sqltune package to tune some resource intensive queries. In this I am looking to know how Sql profile works
I created task for one sql using dbms_sqltune, then in Report it was recommended to accept its sql profile (which will potentially benefits 65%)
then accepted that sql profile with
exec dbms_sqltune.accept_sql_profile(task_name => 'pc1_61d2dhmdwzc8d', replace => TRUE);
and re-executed same query but NO difference in time. Then, what that mentioned potentially benefit 65% is about.
1) Originally query is taking 10 sec to execute, with this 65% i thought that it will execute within 3-4 sec. Is it right?
2)Also, the query for which i have created tuning task has some hardcoded input values, what if i change input values next time, will that profile works with new input values?
FINDINGS SECTION (1 finding)
-------------------------------------------------------------------------------
1- SQL Profile Finding (see explain plans section below)
--------------------------------------------------------
A potentially better execution plan was found for this statement.
Recommendation (estimated benefit: 65.17%)
------------------------------------------
- Consider accepting the recommended SQL profile.
execute dbms_sqltune.accept_sql_profile(task_name => 'pc1_61d2dhmdwzc8d',
replace => TRUE);
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Sep 24, 2012
I am trying to find some way how to tune and optimize the server performance in following situation. There are 100s of sessions inserting records to one table. Sessions are communication threads in java application, each thread is receiving messages that are to be stored in the table. Each message must be commited and then is ACK sent to remove client. Two problems are raising of course - much of ITLs on the table and lots of very small transactions. I can adjust the java application, but cant do much about the design.
I was thinking about some "caching" - if the messages are stored in memory and bulk-inserted to database by single thread the performance would be much higher. However, there would be possible loss of data - the message could be lost from memory cache and client already received ACK.
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Sep 10, 2012
RDBMS - 11.1.0.7, I it possible to convert indexes of a non-partitioned table to hash partitioned indexes by retaining table as non-partitioned?
If yes, is this what it is Creating a Hash-Partitioned Global Index - can be created for partitioned and non-partitioned tables?
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May 1, 2008
How to avoid sort operation by an order by clause without changing the sort area size.what hints or changes should be done in query so that order by clause work faster.
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Nov 18, 2011
I have a table with three columns mentioned below :
Col1 Col2 Col3
121
221
331
431
531
622
722
Col1 is the primary key.I need a sql query which will show the data set mentioned below :
Col1 Col2 Col3 Seq
121 1
221 1
331 2
431 2
531 2
622 3
722 3
I need all the 7 records to be displayed.
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May 22, 2012
Customer is sending data from legacy system (Source) with the web service which in turn calls a package lying on Oracle server (Target). Now this package is simply inserting data passed by legacy system into master staging table in Oracle database. When they started this process in Sept 2011 then 4 lack records were inserted into staging table. In Oct 11 it was 0 records Nov 11 it was 2 lack records, Dec 11 it was 1 lack records, in Jan 12 it was 1 lac records, Feb 12 73k records, Mar 12 0 records, Apr 12 52k records.
As we see that number of records inserted in the table got reduced with time.. what should be the starting point here since web service is calling that package on the fly, how can i enable trace for that package? I cannot replicate this is Dev as this process is only working in PROD.
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Jun 26, 2013
I want to raise a alert after the records retrieved from a query. i.e, if the query fetches 0 records then the alert show be displayed. Is is possible? If yes tell me the trigger to be used to raise such kind of alert.
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Jul 12, 2013
How can I create PLSQL table type dynamically?
I will have to take the Employee Names and create a table structure. Number of employee names can vary from day to day. So, whenever I execute my procedure with Table type, I will have to build the table columns with the employee names.
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Feb 27, 2013
creating Oracle SQL query to fetch the information using PIVOT option.We are populating audit table using triggers. For every update, there will be two rows into audit table, one row with all OLD values and another with all NEW values. Also every updated is uniquely identified by Sequence No. Example for phone audit is mentioned below :
CREATE TABLE test_audit_phone
(
emplid VARCHAR2(10),
seqno NUMBER,
action VARCHAR2(3),
office NUMBER,
mobile NUMBER
);
Insert some rows into table.
INSERT INTO test_audit_phone VALUES ('100',1,'OLD',1111,9999)
/
INSERT INTO test_audit_phone VALUES ('100',1,'NEW',2222,9999)
/
INSERT INTO test_audit_phone VALUES ('100',2,'OLD',2222,9999)
/
INSERT INTO test_audit_phone VALUES ('100',2,'NEW',2222,8888)
/
Table will look like the following :
SQL> SELECT * FROM sysadm.test_audit_phone ;
EMPLID SEQNO ACT OFFICE MOBILE
---------- ---------- --- ---------- ----------
100 1 OLD 1111 9999
100 1 NEW 2222 9999
100 2 OLD 2222 9999
100 2 NEW 2222 8888
Now we have to present data in different format. For each field, display OLD and NEW values in column format.
EMPLIDFIELDOLDNEW
----- ------ ---- -----
100OFFICE11112222
100MOBILE99998888
Challenges :
1) Make pivoting with old and new values
2) For each field we have to show old and new values
3)if old and new values are same, dont show in report.
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May 9, 2011
this is just a generic question. If a table has multiple Indexes on it say a table of 20 columns where 8 columns have indexes on it (each columns out of the 8 has an index on it and out of which three columns contain unique indexes on it).
If i run a query on this table where only two columns are specified in the where clause are the remaining 6 indexes on the table scanned during query execution.
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Oct 9, 2012
on 11g R2 on Win 2008
How to find ddl for any indexes built on MY_VW ?
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Aug 15, 2011
If I have owner, table_name is there a query I can issue that will tell me if I have to add the "update global indexes" clause when dropping a partition from a table?
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Mar 16, 2011
Why we can create indexes only on materialized view and not on normal views?
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Sep 1, 2013
Say we have an employee(id_emp) table with a primary key on id_emp. We have also some history tables emp_stuff with columns say (id_emp, dat_event, some_stuff) with primary key id_emp, dat_event.
This means that we have a unique index on (id_emp,dat_event). We also have a foreign key id_emp that references employee(id_emp). When we update id_emp on employee, we still have a lock on emp_stuff. According to this (end of the page) :
Quote:So, in short, with releases prior to Oracle Database 11g Release 1, you will want an index on the foreign key of the child table if you do any of the following:
Update the parent table primary key
Delete from the parent table
Merge into the parent table
So is id_emp in emp_stuff considered as indexed (through the unique index of the primary key) or do we have to add an explicit index
like this CREATE INDEX emp_stuff ON emp_stuff(id_emp) to avoide child table locks?
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Mar 29, 2012
I have noticed a very questionable phrase on an article updated in 2011: "Oracle SE may allow you to create a function-based index, but you must pay for an EE license to use FBI's." [URL] Is this true? I have tested a FBI on my SE and works just fine.
Connected to:
Oracle Database 11g Release 11.2.0.3.0 - 64bit Production
SQL> create table t ( col varchar2(10));
Table created.
SQL> create index t_idx on t(upper(col));
Index created.
SQL> insert into t values('a');
[code]....
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Jul 12, 2012
How many different types of indexes we have in oracle?
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Feb 22, 2013
Using Oracle 11.2.0.3
We are evaluating partition strategies with view to achieving performance gains in reporting in particular. How efficient are partitioned indexes in this regard e.g.
just partitioned indexes on an un partitioned table.
One large fact table with durrogate keys on which have bitmpa indexes which link to unique key in associated dimensions. Considering partitioning the bitmap index which links to the largest dimension and similarly partition the dimension key on largest dimension.
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Jan 16, 2013
currently i am using below version
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
{CODE}
here is my query to find out the list of indexes and positions in a single schema.SELECT
user_indexes.TABLE_NAME||CHR(9)||
user_indexes.INDEX_NAME||CHR(9)||
TRIM(user_ind_columns.COLUMN_NAME)||CHR(9)||
user_ind_columns.column_position ||CHR(9)||
[code]...
i am trying to spool the output to .txt file. in textfile the output should be in below format :
Table_name Index_name column_names
---------------- ---------------- ------------------
ACS_TEST ACS_TEST_IDX COL1,COL2
C_COLLEGE INX_COLL STUDENT_ID,FIRST_NAME,LAST_NAME,DEPT_ID
Note : Based on the position value the column name have to be placed.
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